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The roof of the house we bought is totally shot, it all must be totally rebuilt (rafters and all). So I'm thinking to just make a flat roof tilted at a certain angle or angles to optimize our solar production. We'll make it generally South facing and the builder said he can do about a 20 deg...

I have a few related issues ... 1-I would like to make a DC USB PD charger for a laptop which needs 100w. House voltage is 48v. Most of our things run on DC, fans, lights, USB charging etc. Is there any special circuitry required or is this as simple as sending 5v over a 20v USB line? I...

So since voltage isn't the best way to indicate SOC with LiFePO4 does anyone know of a BMS which allows protection at x% energy levels (i.e. watt hours)? I've been considering doing a PIC controlled implementation myself but I'd much rather get something off the shelf if it's not too expensive...

I wasn't sure if the BMS forum was the right place to post this or not so feel free to move it admins. So I know Will is now recommending to NOT use low voltage disconnects in conjunction with Dc-AC inverters. I plan on running several DC fans and lights directly from my battery and I'd rather...

Don't do it! .... just don't On Aliexpress

I'm having credit card issues; it just says continuously that the transaction was not approved for security reasons. I chatted with alibaba support, 1 agent gave me the appeal page but the appeal page requires you to select the card being appealed (of which there are none on file b/c the card is...

So does it have 2 bluetooth adapters on there? :P

I searched the forums here a bit before posting; if this has been asked before and I missed, my bad. Is there a nice BMS platform with open source code that supports 48v systems? Ideally I'd like to be able to use it for 12v also, but I only want 1 BMS per system (so that nifty Electrodacus...

Has anyone ordered the 120 AH batteries from XUBA yet? Can you share your experience / capacity test results with me?

Years ago I experimented with mirrors on my home made panels and they really worked to improve power output. I know it can accelerate the age of panels if you go over 100% rated power but I'm curious has anyone done this large scale? Soon (after lockdown is over here in the Philippines), I'll be...

Hey guys, so I'm building a relatively high voltage system: 48v to cut down on wiring costs and other losses. Anyway, I will be running as much as possible off DC (fixing old fans using DC motors, LED lights, etc.) so I can keep the price for my inverter as low as possible. This got me wondering...

I just realized there is this greeting thread for newbies to the forums; so I figured I'd follow along with the local culture and introduce myself even though I'm here for like a month already. I'm from the states, I studied Aerospace Engineering in school but worked as a real-time embedded...

Will reviews a pretty cool BMS though it only allows 50amps charging. Anyway, is this the same BMS on Aliexpress? I'm confused because I don't see a clear manufacturer name in the one Will linked to on ebay but the picture style looks the same and the features seem the same but who knows if it's...

It's too bad I can't use this charger with my 48v battery bank; it's not 20 AH :(

So I'm gearing up to jump in to LiFePO4 and as I calculate and estimate and my spreadsheet gets bigger and bigger, I'm wondering, how real are the charge / discharge efficiencies I read about online? I'm looking to put together a 48v system; where my battery bank will stay between 25% and 80%...

I'd like to get 2.5kw - 3kw for under $200 or a hybrid situation with MPPT for under $350. I've found solutions but it's hard to know if they'll hold up. My load won't usually be 2.5kw on it; I'm adding some room just in case someone hits the 1.3kw blender while the washing machine is going...

I spent a little bit of time searching and couldn't find any resources for this. I've made several solar panels from damaged solar cells sandwiched with glass and eva and they are still working years later. They are UGLY but they work. So I'm curious, is it possible to make an oversized...

So being budget conscious but wanting to reduce cost of components and increase efficiency, here's a probably dumb question: Are there any issues (other than less Whr) to using fewer cells to achieve a classic battery designation? For example, is it OK if I just do 10s to achieve a "36v" battery...

I'm considering building a 36v battery. When I search for BMS it seems most of them are 10s. I noticed they often have "ebike" or something like that in the title headings. Is it bad to build a 10s 36v battery (instead of 12s) for solar applications if I can program the BMS to behave...