Midnight will have batteries of both sizes, I think.
I contacted Midnite and they said new batteries will be available about mid-August but couldn't provide price or specs yet. However, I used their online sizing tool and it says my array power wattage is over what the Classic 250 can handle so I would still need a different brand controller.
Communications with battery can allow for better cell balancing (slow down charge to let BMS do its work). If sticking with your existing inverter, that may not have communications. See if you can get charge controller and battery that play together.
Yikes, have been learning that our current inverter may not have communications with batteries. I contact Ruixu re their batteries and they replied "This inverter is not suitable for our battery, in fact it is not suitable for any 16-string LFP battery. The inverter's Low Battery Trip is too low." So if not suitable for any 16-string LFP battery will it work with any EG4 batteries? If I understand correctly, the LifePower4 is 16-string? Not sure about their PowerPro (I'm having trouble understanding all the battery stuff). Our
inverter manual says low battery trip point is 40 or 42 VDC for utility priority or 42 or 46 VDC for battery priority. Those are the only low battery trip point settings available. Would an option be to keep the inverter for running load from batteries but charge in winter through chargeverters and get matching brand batteries and controllers (ie EG4 as their controllers work with our panel specs)? Sorry a few questions here.
EG4 has PowerPro batteries, which are based on 280 Ah so 14kWh each. Might be better than larger number of 100 Ah 5kWh batteries.
Been looking at both of these. PowerPro batteries are currently available from Current Connected whereas LifePower4 in the 6-server rack are backordered. I don't understand the difference between the 2 types of batteries, other than if I get 2 PowerPro it would be 560 Ah / 28 kWh vs 6x LifePower4 which would be 600 Ah / 30.72 kWh. Which battery is better and why?
You have 7200W (STC) of PV now. What does an insolation calculator say they should produce?
What is your consumption?
You may need more PV, or energy conservation.
Insolation calculator says 30+KW from May to August (40KW in July) down to 4874 to 6753 Watts/day in winter (Nov to January). That's definitely what we've seen. Consumption is approx 20KW/day. We're working on some energy conservation but we work at home so run stuff all day, and have a greenhouse with fans that run 24/7. What we have learned over the last year is we don't have to run the generator barely ever between April and October, if at all (cloudy days still generate enough power), but almost every day from Dec to Feb. If we add more panels it would help a bit, moreso the shoulder seasons, but we get almost no sun in winter. We're in the mountains and between snow & clouds our panels generate barely anything. We may run powerlines at some point in future but for now we're 100% off-grid. So we got used to running the generator for a few hours every day in winter and while we do that we run all the big power stuff at same time (heat, laundry, etc) so that when generator is off our power consumption is minimal. More batteries would help extend the time between charging in winter. I assume that means also adding more panels so that PV can charge the batteries fully in summer as well if battery bank is larger.
The simple way to make sure it all works together is to get AIO and batteries from the same company. Unfortunately the 6000xp is on back order for a while.
The aims inverter will work with any battery, just in dumb mode. As long as you can set the bulk and float voltage to suite the battery either on the aims for grid charge or whatever mppt you end up with.
We have the 12KW AIMS inverter which works great but it has very minimal settings - select battery type and that's it, does the rest automatically. They don't have a setting for lithium so it must be "charge off". I can't find anything regarding lithium in the manual so I will have to call them. As you said, it seems like the simplest thing may be to buy same brand of everything.
Check out this RuiXu thread-
RuiXu
Will is doing a test/review on these batteries right now.
Thank you for the RuiXu link. They sound like good batteries but I contacted them and they said they won't work with my inverter (see above). I was going to call AIMS to double-check but RuiXu also said they aren't yet certified for Canada and we have to go through inspection as it's a new home.
Summary of Above:
- Originally a number of people recommended to keep the AIMS inverter but I'm not sure which batteries it will work with - what do I look for in the battery and inverter the specs to know for sure? Is it the low battery trip point as referenced above?
- Would an option be to keep the inverter for running load from batteries but charge in winter through chargeverters and get matching brand batteries and controllers (ie EG4 as their controllers work with our panel specs)? Or better to replace everything with one brand?
- If replace everything with all one brand...
- It looks like EG4 batteries with two 6000 XPs might be best as far as working with our panels. In that case, which EG4 battery type is best? PowerPro, LifePower4, or LL-S?
- Signature Solar has inverters in stock, and Current Connected has EG4 wallmount batteries in stock (neither have both), and neither have the PowerPro4 6X rack in stock. Trying to find out when will be available, or if I should get the inverters from SS and wallmount batteries from CC and be done - or is that a bad idea to get from different companies if need tech support/have questions?