Twin batteries under drivers seat ?

BenT5

T5.1 | AeroBus | SoLow | Cantera
T6 Pro
Hi all,

Quick question, I need to get more current output to my 2000W inverter, is it possible to fit 2 leisure batteries under the drivers seat ? If not what's the practical max distance you can have 2 batteries apart but connected ?
 
Swap out the battery for lithium.



Or fit two new same matching AGM batteries.



No max distance as it's the connecting cable that's the limiting factor.



Your need super beefy cable and proper decent fuses.



Ie MEGA Fuses.





....





Post some pics of your current setup.





......
 
Thanks for the reply, at the moment I have just 1 100Ah battery, hence the question but have cables and mega fuses ready. Current set up is leisure battery feeding +ve and -ve bus bars with separately fused connections to 12v system, 240EHU/Victron charger and Inverter. Mega fuse from battery to +ve bus is 180A

under seat
cvbat1.jpg
Press in side
cvelec1.jpg
 
cool have a look at the ROAMER SB230SB lithium.

@RoamerBatteries







fits under the seat perfect.

1682344462565.png




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Thanks Dellmassive but the coffee budget would be well and truly blown at over a grand for a ROAMER SB230SB lithium ! .... there must be another way ....
 
Another battery would have to be the same type and pretty close to the original battery.
2000w at 12v is a lot of current to be flowing round the vehicle.

Pete
 
Twin AGM is a cheaper initial outlay. (but more expensive over a 10year term as you will need two or three sets of AGM`s to compare with the one well looked after Lifpo4)

but you will struggle pulling 2000w/200A for any length of time.

Voltage sag under load and with only 50% DoD you wont have much run time,


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more info here:






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You could just replace your 100Ah AGM with a 100Ah lithium - that'll give you, effectively, double your battery capacity.

EDIT: Ya beat me to it @Dellmassive
 
Ok so the Nespresso is rated at 1400W so it's going to pull around 130A ... are you saying the lithium would manage that or that it would just last twice as long. I dont think the issue is how long it lasts as I just need a few mins per coffee .... so a big current for a short time rather than a long time
 
the Renogy above is rated at 100A continuous discharge.

Renogy recommend one 100ah lithium per 1000w of inverter.

so 2x 100ah lithiums will give you the 200A discharge rate for 8000 cycles etc. ( recommended for a 2000w inverter)


1682346639230.png



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pulling 1400w or 130A from one lithium might trip the BMS saftey cutoff.



++++++++++++++++


the Roamer 230sb is rated at 250A max discharge and 3200w worth of inverter.

and has 230ah capacity ( versus 2x100ah with twin Renogys)


1682346823151.png
 
This is true, gas is better at heating water etc.

but sometimes people just like a challenge.

@czmate1999 has a microwave in his van for example. ( he runs twin 100ah lithiums and 3k inverter)

@Rids has a very impressive setup (1600w vic` multiplus)

@Samro has nice setup too.


+++++++++++

i run the 230ah lifpo4 and have 2k inverters, but struggle to fit them under the seat bases due to size,

so for now im running a 1000w Renogy inverter,

ill build a box for the back at some point to house the larger 2k inverters, and may look at moving the battery to back as well so i can refit my under seat sub.


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my seat bases:

1682403353865.png

.


1682403490286.png


.




and mobile box builds. . . .




1682403530354.png
 
This is true, gas is better at heating water etc.

but sometimes people just like a challenge.

@czmate1999 has a microwave in his van for example. ( he runs twin 100ah lithiums and 3k inverter)

@Rids has a very impressive setup (1600w vic` multiplus)

@Samro has nice setup too.


+++++++++++

i run the 230ah lifpo4 and have 2k inverters, but struggle to fit them under the seat bases due to size,

so for now im running a 1000w Renogy inverter,

ill build a box for the back at some point to house the larger 2k inverters, and may look at moving the battery to back as well so i can refit my under seat sub.


++++++++++++


my seat bases:

View attachment 197075

.


View attachment 197076


.




and mobile box builds. . . .




View attachment 197077
I agree, each to their own. But we have lithium & a 1600w Sterling inverter. I wouldn’t be without the Lithium battery, but in 6 years of having the van, we’ve only used the inverter once in anger. If I was doing another van build, I wouldn’t bother with the inverter.
 
I agree, each to their own. But we have lithium & a 1600w Sterling inverter. I wouldn’t be without the Lithium battery, but in 6 years of having the van, we’ve only used the inverter once in anger. If I was doing another van build, I wouldn’t bother with the inverter.
I wouldn't be without my inverter since recognising how little power a sandwich toaster actually uses!...... Sure it is 900w, but once hot it only draw 900w for around 10% of the time. For me, taking one of these has been a game changer to allow a quick hot toasty or panini or omelette.

 
I wouldn't be without my inverter since recognising how little power a sandwich toaster actually uses!...... Sure it is 900w, but once hot it only draw 900w for around 10% of the time. For me, taking one of these has been a game changer to allow a quick hot toasty or panini or omelette.

I wouldn’t be without my inverter either… a compact kettle of about 900W makes a pair of nice fresh brews in the van without getting out of bed ! Especially fine on the way back from the Alps with -5C outside & ice on the inside of the windows at 6am…
Horses for courses and all that!
My battery is the older 200Ah Roamer seatbase unit and is limited to approx 120A.
When on a camp and set up I’ll use gas… outside or at the edge of the van…
 
I wouldn’t be without my inverter either… a compact kettle of about 900W makes a pair of nice fresh brews in the van without getting out of bed ! Especially fine on the way back from the Alps with -5C outside & ice on the inside of the windows at 6am…
Horses for courses and all that!
My battery is the older 200Ah Roamer seatbase unit and is limited to approx 120A.
When on a camp and set up I’ll use gas… outside or at the edge of the van…
My battery is the older type roamer underseat battery too.
I don't suppose you happen to have screenshots of the bms settings?
I am sure that my settings are wrong! For a start the capacity is set at 180ah. I am sure it was sold as 200ah and I struggle getting the bms and the smart shunt to reflect the same figures.
 
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