100ah vs. 200ah

Soggy Man

New Member
Joined
Nov 28, 2020
Messages
8
I'm getting ready to build a van for travel with solar panels and dc/dc charger. Would be better to get 2 100ah batteries or 1 200ah battery. What is the difference other than the case size size.
 

Rednecktek

Solar Addict
Joined
Sep 8, 2021
Messages
771
2x 100ah give you some redundancy, single battery is easier to pack. Cost wise I think the 2x batts are a little cheaper usually.

If I had the space I'd lean towards the dual batteries for redundancy. At least then I can still power things while I'm waiting on a new battery to arrive in the mail.
 

MisterSandals

Participation Medalist
Joined
Nov 5, 2019
Messages
5,053
Location
Silicon Valley
If you are considering lithium batteries, then you will also have one or two BMSs. With BMSs you will have to consider their amp ratings/limits and how they behave in parallel with other batteries.
 

time2roll

Photon Sorcerer
Joined
Mar 20, 2021
Messages
2,402
I would be inclined to get the 200 Ah to keep it simple. As said above, verify the specifications meet your needs.
 

PerryB67

Solar Enthusiast
Joined
Sep 27, 2019
Messages
63
Depends on what batteries you're buying. If lead acid I would buy two 200 ah or larger 6 volts vs one 12 volt, or two 100 ah 12v batteries. 6 volt lead acid batteries are better suited for deep draws.

If lithium, I'd get two 12v 200 ah batteries for redundancy, but that's just my opinion

Enjoy,

Perry
 

Isaac-1

Solar Enthusiast
Joined
Nov 4, 2021
Messages
85
Depends on your max amp draw, most 100 AH batteries have a 100 amp max power draw, when you have 2 in parallel they can provide a max draw of 200 amps, which you may need if you have an 2000 watt inverter, by contrast many 200 AH batteries, hav a BMS with a max amp draw of 100-150 amps, though a few do support 200 amp max power draw, so it all comes down to your needs.
 

corn18

Village Idiot
Joined
Sep 9, 2021
Messages
305
Depends on your max amp draw, most 100 AH batteries have a 100 amp max power draw, when you have 2 in parallel they can provide a max draw of 200 amps, which you may need if you have an 2000 watt inverter, by contrast many 200 AH batteries, hav a BMS with a max amp draw of 100-150 amps, though a few do support 200 amp max power draw, so it all comes down to your needs.
Agree with this. I went with a single 200Ah but could not get enough amps out of it to run a 2k inverter. So I had to buy another 200Ah battery. Not the end of the world but expensive.
 

time2roll

Photon Sorcerer
Joined
Mar 20, 2021
Messages
2,402
Agree with this. I went with a single 200Ah but could not get enough amps out of it to run a 2k inverter. So I had to buy another 200Ah battery. Not the end of the world but expensive.
A 2K inverter could be pushing the pair of 100s pretty hard. Much better with the pair of 200s.
 
Top