Winter 2022 - Mobile EHU and battery charging via 12v socket.
right so its winter / xmas 2022 so the van will be layed up for a while. . .
possibly 2 weeks or more. . .
so this time i thought i would demo the
Mobile EHU method using a Portable Power Pack and mains charger.
this is what we are going to use . . .
I've fully charged the
ECOFLOW River Pro 600 . . . .
its
720Wh capacity. ( your see why this numberr is important later)
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next up we have the charger . . .
im going for a small smart charger for this test,
The
NOCO Genius 5A Smart will do the trick,
and to make things super easy were adding in the
NOCO 12v plug adapter:
its fused at 5A and plugs into the charger, . . . . this then enables us to
plug into the vans 12v sockets.
on the
T6 the sockets are connected direct to the battery, so can be used to charge via them,
but you need to make sure the
Charger Amps is between 1-8A as running 10A through this type of connector will make it get hot.
so 8A is generally considered the max to use this port . . . .
were using a
5A charger . . . so fine.
the van has been sitting for a day or so, so we should have a
starter battery around 80% SOC.
and my
LB that connected via a RENOGY DC50S dc-dc charger.
(I've dissabled the Ablemail AMT2-12 for this test)
we start with this:
we start by plugging in the charger into the 12v socket:
(on this van we have the OEM Factory LB fitted, that means that the
LOWER socket is connect to the STARTER battery . . . and the
TOP socket is connected to the LB)
so for this test we are plugging into the
LOWER SOCKET which is connected to the STARTER battery.
next up we power on the ECOFLOW and the Charger. . .
we can see as the charger starts we are drawing
83W as its starts to charge the battery . . .
this is the setup. . . .
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a few hours later we see this. . . .
the
ECOFLOW app shows its down to
69% and still delivering
87W to the charger.
checking the
BM2 battery monitors we can see that both the starter and Leisure battery are showing that they are charging. . . . as the voltage is rising and above both batterys rest voltage
we call this
AUTO VSR, (both batterys being charged from one charger)
what's happening is that the NOCO charger is
charging the starter battery. . . .
as the starter battery voltage rises the
RENOGY DC-DC charger automatically turns on and starts to
charge the Leisure Battery.
you can see this on the voltage plots above.
having a look at the
Victron Smart Shunt on the LB we can see that out of the
87W going out the ECOFLOW,
44W are going to the LB, so
44W is going to the starter battery.
at this point the
LB is 96% SOC and rising
here is the smart shunt showing the LB plot over time . . .
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so while the test is running - what do we expect to happen?
well we know the van keeps the starter battery at
80% SOC,
for a standard AGM battery we have 1000Wh,
++++++++++++++++++++++++++++++++
(W=V*A)
(12v AGM battery 90Ah =
1080 Watt-Hours)
assuming SLA 50% DOD
1080Wh / 2 (50%) =
540wh usable power in the starter battery
1080Wh / 100 * 20 =
216Wh this is the expected 20% power to
raise the starter battery from 80% SOC to 100% SOC.
++++++++++++++++++++++++++++++++
this means we can expect to
use 216Wh to fully charge the starter battery ( From our 700Wh available in the ECOFLOW)
but we also need to factor in the Leisure battery, that is now being charged via the RENOGY DC_DC . . . charger,
that's around
96% SOC atm . . . . .
the battery is a
ROAMER SB230 from
@RoamerBatteries
Roamer SMART4, XTREME and HOME - the next generation in 12v 24V and 48V LiFePO4 lithium leisure batteries for campervans, motorhomes and boats. From 100Ah to 460Ah capacity with Bluetooth BMS, Victron GX integration, Active Balancing and low temperature charge protection. 5 Star UK support, 10...
roamer.com
it has a capacity of
230Ah (2944Wh) - so
10% will be around 294Wh.
+++++++++++++++++++++++++++++++++
that means we are expecting to use up the
216Wh for the starter battery and
294Wh for the leisure battery, so around
500Wh is to top up both batterys.
(were using rough maths here and not factoring in % conversion loses and efficiency losses )
basically im expecting the ECOFLOW River to dump all its capacity into charging both van batterys over the first 24hrs. . .
then i can recharge to the ECOFLOW tomorrow . . . and start a new charge cyle back in the van.
at that point im expecting the ECOFLOW to run a lot conger as both batterys will be fully charged, meaning that the charger should be in float mode.
lets see what happens - and how long we can keep this up.
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.