Search results

This email is to give a serious warning to all users that are planning to buy SAJ inverters. https://www.saj-electric.com/ I recently acquired a SAJ inverter (SAJ R5 SERIES 5000W 2 MPPT) despite all the bad app reviews. https://www.saj-electric.com/solarenergy-detail/64 While it seems to...

One example: https://www.myevios.com/products/evios-one

I have one and can tell you from experience. Lowest reading and start of charging is 11W. Any value below will just trigger the MPPT consumption without charging and drain the unit.

In my case I got 73W out of the 80W advertised. If I used the maximum input voltage the unit can take and output the maximum voltage the unit can offer, I'd get much closer to those 80W. So indeed, If you want 500W, get a buck for 600-800W. Then the overheating will be more balanced and you'll...

Then what about a DC-DC buck boost converter with current limiter? I have one and it can transform a DC voltage into a lower or higher voltage while providing a current from 0 to 5A with 0,001 accuracy. Problem is that mine is only for 80W, but there should be for 500W. Example...

You may use a step-down module. In Aliexpress there many. Step-down module is a very easy way to supply a current at a voltage no higher than the supplied. The nominal power of the module will limit the current or you may purchase one with current regulation for some extra dollars...

Greetings solarists, After 3 years of experiments with small setups, I finally have the chance to arrange my first resindential solar installation. For greater odds of success, I would like to introduce you to my initial proposal to collect some of your thoughts. Consumptions: 4.650 kWh/year...

Yes I do. Standby consumption is 1,5W. Efficiency of conversion 80-85%. I could not measure it accurately, but around 82% If I remmeber well. MPPT mode with a solar panel works like a charm. Battery mode is disappointing; the regulation with the spinning wheel is not very fine (eg. jumps from...

Here you can follow a post based on the same article. https://diysolarforum.com/threads/sorry-will-not-be-worse-than-plastics.63833/ I see this matter also as a disaster; specially because we humans react on problems rather than prevent them. Even sectors we think have been properly ruled out...

Observed the same warning for a 100Ah 12V Renogy battery. I found also this online: There is no theoretical limit to the number of batteries that can be connected in parallel. As more batteries are paralleled together, the risk of one faulty battery affecting the entire battery bank increases...

As kind of mentioned above; this looks like a propeller for a centrifugal blower. In the factory I work these are used at rotation speeds of >2.000rpm while eolic turbines operate at around 20rpm. Your propeller can probably rotate faster than a giant eolic turbine but even If you get it up to...

There are many different setups I would recommend you depending on many different factors. Until now; I am in the same situation you are with 2 changes, what I rent is an apartment (balcony) and it is in The Netherlands (NL). So for me the determinant values are: Regulation and Consumption...

Hedges, that is the same thought I had a while ago but I changed it over time based on comments of scientists I decided to trust. Besides having material limitations due to imperfect recycling methods: Best recycling technologies recover 99% but totally omit indium, gallium, selenium, cadmium...

My opinion on all this is very pessimistic although I am happily surprised to see that silver is theoretically being recovered already. Great, because a panel it is said to have up to 3% of silver in weight. Why pessimistic? 1) At this moment, limited financial incentive for recycling the...

Just saw one of the recent releases from Ecoflow called Powerstream. It is like an hybrid microinverter with an elegant data visualization (wattages coming in and out) that allows a certain degree of power management, like how much you inject to your home or the grid (in case of surplus), or...

There is something wrong here; li-ion cells are full at 4,2V per cell; so SOC should be 100%. LiFePo4 cells full charge voltage is 3,65V per cell while charging, so you are far beyond that already and also should have reached SOC 100%. Any way to calibrate the BMS with your battery? Maybe the...

Does this happen after or while you use the battery? Could the battery be full and that is why it does not charge? cell volt high level 1; one of the cells has a too high voltage? Can you please provide screenshots of the Daly app to see all the cell voltages and SOC?

I have these type of panels bought from Aliexpress and have not seen any sudden worsening even them being exposed to high temperatures, hail and strong winds. They are 100W at Vmp 16V instead of 18V. I have 2 in series connected to a MPPT grid tied inverter. They have never delivered more than...

They are wonderful for balconies as their weight is much lower and their little flexibility allows them to absorb the wind tensions. I put 2 in my balcony and survived one of the worst storms in many years here in the Netherlands, Europe. Probably because they are Aliexpress panels, their yield...

Thank you for your patience. Very clear now. So If I connected 2 of those 12V BMS's for a few seconds, it could be instant fry! Thanks god you explained because I was feeling tempted to try.

The BMS can not just look at the individual voltages of its cells? I understand that the string is 24V and the BMS is made for 12V, but the cells voltages are still 3,2V. So what you are saying is that the 12V BMS's that do not allow series connections monitor the string voltage.

Thank you for your replies. I was trying to understand better what is wrong with connecting 2 LiFePo4 12V batteries with individual BMS in series, specially when the manufacturer says it should not be done. Recommendations are made for a reason; manufacturer or specialists look for the safest...

So actually from what I read here, is it correct to say that putting 2 LiFePo4 12V batteries with individual BMS in series is "bad" and 8 LiFePo4 cells in series without any BMS worse? Regarding 2 LiFePo4 12V batteries with individual BMS in series; are we talking about worse performance...

Mine is in the bedroom. During the evening its noiseless and I covered its lights with paper. Also, If it explodes and destroys the house, I will probably die saving myself the burden of all repairs and payments.

Side question: With an inverter like this, assuming that your battery is small at first and you don't want the inverter pulling more than 1C; can the load applied to the current be limited? (and thus that rest comes from the grid) Or battery always has to be aligned with inverter max. capabilities?

Well, first of all thanks to introducing me to the ATS. Sounds stupid but you opened me a whole world of possibilities now. To me your approach seems right by means that you only spend on batteries and reuse all the equipment you already have + the ATS. That would be the optimal solution If it...

Not now, but yes in a plan in which renewables are implemented to cover current consumptions. A good example are batteries. Now there is no lithium scarcity but If you think of a near-to-complete replacement of all combustion cars to electric cars, according to what some scientists say, there is...

Thanks for your answer. I very much hope it is well estimated; that would give quite some extra margin on using solar to solve the climate change puzzle. I will read it through carefully.

When there is no net metering, people start taking this into account. What I have seen is colleagues over panel to cover more orientations; it works for them because panels are cheap, not sure the world can afford having panels producing 30% of their nominal output but I find it comprehensible...

That is a very interesting info to be read slowly. (and I will) The concerns I have come from a reputable scientist saying in optimal conditions the energy return of solar could be just 3 times after its full life-time (so 8-9 years payback); that takes into account the whole cycle of...

I understand most of this argument and agree in many aspects to the problems/limitations you are presenting; the proposal you make I find somewhat challenging to accept because to me the solar energy drawbacks are not poverty related but thermodynamic. Concretely I can name 2 negative impacts...

Hi Gridworks, nice summary. 3 arrays, 9 100W 12V panels in series each, and a total of 2500W AC available after the power board. You are backed up by the grid. Do you inject to the grid too? Or zero injection? Rule of thumb for grid-tied solar is that it can cover 30% of the household demand...

Gridworks, I am really fan of your doings just sometimes have trouble to understand what you are doing because I am not experienced. I really can see you worked with electricity before. Perhaps when you finish big expansions like the new array you are about to add you can take the chance to...

The phone you can charge with a USB 5V module often included in these small 20W panel; the module delivers up to 20W at 5V, just what phones need; which is 5-10W. This one is easy. For the laptop I doubt you can directly charge it with a 20W panel, often they require at least 40W in shut off...

You could: 1) Cover the panels that you do not need (if you have the panels divided in 3-4 arrays) to preserve their physical integrity and extend their life and performance. Then you will save replacement costs in the future. 2) Produce an e-fuel and sell it. One example is ethanol from some...