Solar Panels to 2x battery banks ( Lithium and AGM )

[Renogy Solar]

So… don’t use a dual pole transfer switch?

split the panels into 2 groups and feed to AGM and Lithium separately with 2 different MPPTs.. ?

That's what we recommend.

 

[Renogy Solar]

I opened the batteries.. DC home app finds one of the batteries but not the other one. Both batteries show 13.22 V.

What could be wrong?

Can you send me a video of the connection in action? So that I can determine the problem.

 

[Marktla]

I was able to see both batteries together. I used the HUB mode. please see attachment.

one question, when can I connect them in parallel and make them as a battery bank? currently they have a slightly different state of charge and voltage… charge them full first?

I don’t have a Lithium charger to charge them from AC , shore power. I have DC-DC Renogy chargers ( 40A and 60A ) and 2x Rover 60A MPPTs. I guess I can charge them with solar..

I have the 3000w renogy inverter… what thick / rated cable I need to use between the batteries? They are 20-30 cm from each other.. side by side.

I wanna use kitchen appliances, washing machine over the inverter. I guess I will pull 50-100 Amps from the batteries in normal use and possibly 150-200 amps when using the washing machine.

are the cables came with the inverter good enough for these amps? Inverter will also be next to the batteries.. 20-30 cm away.

 

[TimE]

First question, why do you have AGMs? Is this a legacy from pre lithium? If the answer is yes, then you are very unlikely to use those batteries once you have the lithium set up. Charge the lithium with all the solar. It will have way more efficiency than the lead batteries. Wasting some of your solar to charge the AGMmakes no sense. You won't be using those batteries in my experience so charge them with DC DC. You will live of the lithium bank and the solar efficiency will be nearly double compared to using solar and AGMs. The main reason for this is that on lithium you will rarely get off the bulk cycle of charging. The solar will work hard.
We used to harvest just over 2kw of solar a day off 720w of solar and lead batteries. Those same panels harvest 3.5kw per day on lithium.

 

[Tomthumb62]

I was able to see both batteries together. I used the HUB mode. please see attachment.

one question, when can I connect them in parallel and make them as a battery bank? currently they have a slightly different state of charge and voltage… charge them full first?

I don’t have a Lithium charger to charge them from AC , shore power. I have DC-DC Renogy chargers ( 40A and 60A ) and 2x Rover 60A MPPTs. I guess I can charge them with solar..

I have the 3000w renogy inverter… what thick / rated cable I need to use between the batteries? They are 20-30 cm from each other.. side by side.

I wanna use kitchen appliances, washing machine over the inverter. I guess I will pull 50-100 Amps from the batteries in normal use and possibly 150-200 amps when using the washing machine.

are the cables came with the inverter good enough for these amps? Inverter will also be next to the batteries.. 20-30 cm away.

No time to answer all your questions, but for the sake of all things holy, don’t use the cables Renogy sent with the inverter.

Yes you can charge up each battery to full then connect in parallel. An AC charger is best for this.