Veteran Webasto owners

I’ve had nothing but issues with my webasto and finally thought I’d cracked it but it’s now only working for a couple of hours at best. What do you guys that have had them installed ‘professionally’ run them on battery wise. Single high capacity battery? Twin batteries? Stand alone battery for webasto only? How long does it generally last in the working day.

I start mine up before I set off - so it’s on charge and not draining the battery. I have a split relay so have the ability to charge on the go if needs be. I know it all leads to needing a larger battery bank but I was curious to see what everyone else was running in case I have an issue with the webasto itself. I brought a new leisure battery as the one I had was on its way out but it hasn’t made much of a difference to the overall running time. I’ve put my electric hose reel on a separate battery as I know that has quite a high current draw but it hasn’t made much of difference today.

Your input is appreciated

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What wire gauge are you using from the battery to the heater?

that's quite a good question there neil  i use an eberspacher  so can't really help you with the heater, battery wise I have three 100ah batteries wired in series parallel so have 300ah in theory depending on heat etc etc, I also have a diesel air heater which I use for the cold nights to heat the van so it doesn't freeze, the split charge relay more than copes with keeping the batteries charged up and I've had no issues so far (fingers crossed) I never really got my head round why these heater suppliers use a separate battery for the heater/burner and one for the pump etc, gauge of the wires as geyser heat pointed out will make a difference but given your background i'm sure you've covered that already.

try two batteries in series parallel to start with and see if it helps, failing that it might help to keep the heater on for the morning to reduce the draw on the ampage and return the heat/flow to the tank

Geyser Heat said:

What wire gauge are you using from the battery to the heater?

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2.5mm for power plug then 1.5mm for the 6 pin connector


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kevinc250 said:

that's quite a good question there neil  i use an eberspacher  so can't really help you with the heater, battery wise I have three 100ah batteries wired in series parallel so have 300ah in theory depending on heat etc etc, I also have a diesel air heater which I use for the cold nights to heat the van so it doesn't freeze, the split charge relay more than copes with keeping the batteries charged up and I've had no issues so far (fingers crossed) I never really got my head round why these heater suppliers use a separate battery for the heater/burner and one for the pump etc, gauge of the wires as geyser heat pointed out will make a difference but given your background i'm sure you've covered that already.
try two batteries in series parallel to start with and see if it helps, failing that it might help to keep the heater on for the morning to reduce the draw on the ampage and return the heat/flow to the tank

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I have the pressure release valve circulating back in to the tank on start up and between jobs. If I’m expecting a chatty Kathy on a job I’ll also have the water on a recirculating circuit. My fear was I’d need a substantial battery bank. I use my local marina for red diesel now (and lpg as back up) and they said boats have a minimum of 3 batteries - obviously the workings are a bit different but I really don’t have the room (or payload!!) for 3 or more batteries. Have you always had 3 batteries kevinc250 or is this part of the fancy tackle you have now? I’m selling the van soon and want to sort out these niggles before I advertise it. The new van won’t have the issue as I already have two beefcakes wired in with room for more - plus I’m considering not having a webasto and just running an immersion instead


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Batteries are two x200 amp gell heavy dutie , they run  two pumps every day and 3 pumps occasionally  and the heater 8 hours a day when working from home base they are charged every night by a specialist charging system that a friend of mine installed, I think it’s over kill but would rather have spare capacity than run into problems 

I had and still have a thermo pure stystem-must sell that by the way?,I had a few issues with it more so by me not charging the sole battery every night,it was a learning curve that cost me a few bob.

yes "the fancy tackle" I have now is more based upon my experiences in the past and how to avoid them type of thing although i'm still not 100% sure i'm correct in the way i'm heating the water,my mind thinks immersion is the simplest option but with no "wriggle room" should you need that extra heat

Pjj said:

Batteries are two x200 amp gell heavy dutie , they run  two pumps every day and 3 pumps occasionally  and the heater 8 hours a day when working from home base they are charged every night by a specialist charging system that a friend of mine installed, I think it’s over kill but would rather have spare capacity than run into problems 

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Do you run electric reels as well @ Pjj


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kevinc250 said:

I had and still have a thermo pure stystem-must sell that by the way[emoji849],I had a few issues with it more so by me not charging the sole battery every night,it was a learning curve that cost me a few bob.
yes "the fancy tackle" I have now is more based upon my experiences in the past and how to avoid them type of thing although i'm still not 100% sure i'm correct in the way i'm heating the water,my mind thinks immersion is the simplest option but with no "wriggle room" should you need that extra heat

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Still need to have a chat about the erberspacher. I’m finding the Webasto’s very high maintenance (PITA) but have them coming out of my ears at the moment so need to crack this one!!!!


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AGlassAct said:

Do you run electric reels as well @ Pjj


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Still need to have a chat about the erberspacher. I’m finding the Webasto’s very high maintenance (PITA) but have them coming out of my ears at the moment so need to crack this one!!!!


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  No manual ones that’s a project fir next year