Hi Dan and All,Volt modules are very forgiving, robust assuming you stay
within voltage, temp specs. A major advantage is not having the cost, hassle
of a BMS which can increase cost 50-100%.In the trike I just paralleled the
48vdc sections in the 4kwh module and fused each section/string in your case
and ground because these suckers put out 1k amps/section in parallel.I make
fuses from solid copper wire from 16-14gge from the battery terminals, just
make sure they fail safely. I'm using a negative and positive 14gge ones on
my S-10 Bolt module pack and haven't popped .Make sure they are about the same
string voltage when connecting them and check each cell voltage before anything
to make sure they are within 2/100th of a volt of each other showing they are
balanced. If not you'll have to balance any cell to that standard. and note
which one/s were off. I've never had a cell out of that spec or ever had to
balance one in the 10 or so packs I've gone through, In fact never outside of
1/100th a volt difference which impressed me. I just hope the Bolt modules do
as well...On your high voltage you need special DC rated ones. I'd drop amp
size down until one blows then use the next size up. Some 100amp fuses can
take 300-400amps to actually pop.In a boat be careful that much voltage in that
damp. Being wet you can get shocked by 12vdc, 162vdc would hurt or worse so use
best practices.As one who designs, builds boats try to use the largest diameter
prop you can turning as slow as it can you can get 2-3x the thrust from the
same Kw by being more efficient, less prop frictional losses.Use a multihull or
on a planning boat, wide, lots of planning area of the lightest weight..For
that kind of continuous power you need the cooling. For nothing else but to
keep each cell the same temp and within temp spec.Note if you are boating,
anchored in tidal or river 2.5mph + currents you can regen/charge your
batteries from many PM or A/C systems, regening. At that HP I assume it's
AC.If a big heavy boat without being optimized, range is likely to be very
short.Stock iirc they put out 137kw to power the Volt motor and racers get
300kw,1k amps per string. They use 2 packs with Tesla controllers, rear drives
mostly.Jerry Dycus
On Friday, March 5, 2021, 06:31:25 AM PST, Dan Baker <[email protected]>
wrote:
Thanks Jerry for your practical use of parallel pack info using Volt batts!
Bummer on the trike - glad you are ok! Did you just use a fixed charge
connected to all the packs , no diodes or contactors? It seems more ppl are
using Volt packs without any BMS than those that use one. I'm going to be
squeezing these Volt packs a little harder than stock though- think the cells
might get out of balance more? The pack is going in a big boat and I would
like to see 100hp (or ~ 450 amps @ 162V) for a few fun pulls. Boats are like
cars except they are always going uphill, no regen or a break in power until
the cruise is over. So yes going to use their built in cooling if possible.
Thanks againDan
On Fri, Mar 5, 2021 at 8:04 AM jerry freedomev <[email protected]> wrote:
Hi All,Tuesday I was slowing for a light and a compact hit me at at 50mph
from the rear in my 700lb EV trike pickup and unlike the one 20 yrs ago in my E
woody which only took $40 to put back on the road, the trike was totaled.Again
good engineering using my rear tires as a crash load absorber and me going
25mph took the crash impact greatly cutting the impact forces to where I
could hold onto the handlebars and ride it out fairly safely.It worked great
with 4 Volt 2kwh 48vdc banks/sections in parallel without a BMS for 2.5 yrs.
Sadly they did not survive.I got my new to me S-10 EV going and cutting the
voltage of parallel Bolt modules but will have to limit it to 120vdc so only
36kw instead of the 144vdc 48kwh I wanted. So today I get to test it's range
so I know what it'll do on a single charge and build the aero camper to cut
weight and improve aero to .25cd or better. One problem is the Curtis 1231C
whines all the time vs cutting out after it gets out of low speed. Also
whines when stopped. Any advice to stop these or what the problem might
be?Thanks, Jerry Dycus
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