How long to charge battery with solar?

boiseites

We have a 2021 320S, for which we have purchased the https://smile.amazon.com/Renogy-RNG-KIT-STCS100D-SP-Monocrystalline-Controller-100W-Waterproof/dp/B01NADR1CI/ref=sr_1_1?dchild=1&keywords=Renogy+100+Watt+Eclipse+Monocrystalline+Charge+20A+Voyager+Waterproof+Controller+Solar+Suitcase,+100W-Waterproof&qid=1620271185&s=lawn-garden&sr=1-1 
We just hooked it up (no problems!) and are awaiting it to fully charge our new Renogy 12V 100AH AGM battery. About how long should it take? Full sun today.

Dutch061

Loaded question, max solar charge rate will be around 8 amps (100/12=8.33). So it depends on the state of charge in the battery when you begin.

Brad

boiseites

Well, it is a brand new Renogy battery.  So, minimal charge???

Dutch061

It will still depend on the depth of discharge. The age of the battery (older has higher internal resistance) will take longer to charge or may not fully charge. 

Example, if in 24 hours you use 24 Amp Hours it will take at least 3 hours to fully recharge in full sun. You can replace the energy used (measured in Amp Hours) at the rate of approximately 8 per hour. 

The only way to reduce the charge time is being able to charge at a higher rate or use less energy. 

Brad

pthomas745

What are you using to monitor your battery?  What readings are you getting?  Are you measuring a "rested battery?"

Sharon_is_SAM

Be aware that it can take a new battery multiple cycles before it assumes it’s full capacity.  Check out your battery specs.