Wallas stove wiring

Slipknot · Posted: Tue Oct 03, 2017 12:08 pm Post subject: Wallas stove wiring

When the Wallas was installed on my 25, it was wired directly to the start battery with a in-line fuse. I understand it needs full voltage directly off the batt, but seems to me it should come off of the house batt.

Any reason why it should stay on the start batt? I like heat, but not at the expense of a low cranking battery! Thanks.

PaulNBriannaLynn · Posted: Tue Oct 03, 2017 3:15 pm Post subject:

Im no wallas expert, but I would guess its because the unit requires a fully charged battery to heat the glow plugs when first starting up. I think I remember reading 12.6 or 13 amp minimum.

All these boats were rigged differently depending on which dealer they came from. Ours had two batteries with a 1 - 2 - both switch.

I can attest how much of a bummer it was when I ran my batteries down too low with my cabin lights and radio before going to sleep, and when was at 4 am, the wallas wouldn't start. I'd put too much faith in the old unit, and should have brought an extra sleeping bag instead.

hardee · Posted: Tue Oct 03, 2017 4:06 pm Post subject:

My Wallas has never not started when I needed it. It runs, started on High and shut down on high every time. It is wired directly to a start battery. I have 2 Batteries, and each one is a start for the OB on that side of the boat. I do have a 1-2-Both-Off switch, but the wallas is hardwired with a fuse to the stbc battery, the #1, on the stbd side.

And yes, they do like a fully charged, steady current. I run mine with either the OBs on or off, but not through a transition from on to off or the other way.

Harvey
SleepyC Moon

Slipknot · Posted: Tue Oct 03, 2017 9:28 pm Post subject:

Thanks, that makes sense. I'll just have to watch my start battery voltage and not let it get too low.

I can always fire up the kicker and let it charge the battery for 5-10 minutes. The Suzuki 9.9 fuel injected will start with the recoil starter even if the battery is low (or so they say).

thataway · Posted: Tue Oct 03, 2017 11:26 pm Post subject:

You are not going to get a lot of current into a battery in a few minutes of running. The "alternator" puts out 12 amps--so an hour would give your 12 amps (probably a little less because of power for the ignition of the outboard). A voltage of 12.2 is about 50% discharged. For the average Group 24 battery which is 60 amp hour capacity, it would take about 3 hours to bring the battery up to full charge.

We do run our Wallas off the house battery, but monitor all of our batteries by voltage, and the house by SOC and amps in and out. We do have several ways to charge the batteries, including running the main engine, or our Honda EU 1000 running a 30 amp charger.

PaulNBriannaLynn · Posted: Wed Oct 04, 2017 9:07 am Post subject:

Discovery · Posted: Wed Oct 04, 2017 4:10 pm Post subject:

Our Wallas used to start with no problems. Maybe because the batteries were new. Now after 12 years it still starts every time, but only if I start the stb motor, and let it idle while I start the Wallas. Starting the Wallas without starting the motor first, results in a flashing red light on the Wallas, and NO start. Even if the battery monitor say's the charge is 12.6 V the Wallas doesn't start if the motor is not running.

I don't know why? I just start the motor first and all is well.

We used the Wallas at least twice each day on our recent 8 weeks on board. Only one NO start. I didn't start the motor first. The only problem comes when we are boater homing on the land and can't run the boat motor. Then we just use the Honda 2000i to make coffee, and the microwave to cook.

thataway · Posted: Wed Oct 04, 2017 4:16 pm Post subject:

Moxieabs · Posted: Wed Oct 04, 2017 8:25 pm Post subject:

I always thought the reason to wire the Wallas directly(fused) to any battery was to prevent an interruption of the shut-down(cool-down) sequence.

Discovery · Posted: Thu Oct 05, 2017 12:11 pm Post subject: