question

Osian avatar image
Osian asked

Van schematic

I've assembled a few systems but this is the first system I've specced. It's designed for a small van (Renault Trafic) with a fairly small demand - USB chargers, fridge, heater.

Orion-tr 30A, SmartSolar 75/15, BlueSmart 12/17, BatteryProtect 12/24-65A, BMV-700, 100Ah AGM battery.

I'm not sure whether I need a BMS or not.

schema.pdf

BMSschematics
schema.pdf (47.0 MiB)
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

5 Answers
Sarah avatar image
Sarah answered ·

hi @Osian diagram looks like a nice neat solution. You won’t need a BMS as you are not using Lithium batteries. You might benefit from a small isolation/fuse for the incoming PV link so that you can safely and easily isolate the solar panels. Lastly I assume by ‘heater’ you are referring to a diesel fuel heater that you are supplying power to operate the fan or something similar - if you want to use the battery to generate heat you are talking a significant power draw. Have fun.

2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Osian avatar image
Osian answered ·

A fuse before the solar controller?

Yes, a diesel fuel heater. The simplest solution on a budget.

Many thanks @Sarah

1 comment
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Sarah avatar image Sarah commented ·
Yes - a fuse/switch between the solar panels and the MPPT controller.
1 Like 1 ·
rvicev avatar image
rvicev answered ·

@Osian :

In this scheme, if there is no solar input how are you going to prevent that the Victron AGM battery is not going to be charged from the Renault Traffic Bosch starter battery when the engine is not running ? If it is a recent Traffic it has a modern alternator which is managed by the Traffic´s engine management system / CAN bus, and there is no D+ signal to indicate that the engine is running ..... ? If the Orion takes up to 30A from the starter battery, you may/will end up with a dead starter battery ?

I´ve considered doing something similar in an even smaller van (a Renault Kangoo, with start/stop system) and my Renault garage strongly advised me not to connect directly to the starter battery, but only via the cigarette lighter (accessoiries) circuit. In this way it is taken into account by the engine management system as an ordinary consumer, but obviously you´re limited to 10A max.....

6 comments
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Osian avatar image Osian commented ·
This is a 2004 Trafic. The Orion has engine shutoff settings so it only takes from the battery at a certain voltage and also a time delay. It won't drain the starter battery.

Putting it onto an accessory circuit won't limit how much it can draw, it will overload the circuit capability and blow the fuse. The cable isn't designed for such a draw, so if you do put a larger fuse in it will melt the cable. I could use a relay so it is switched with the accessory circuit but I don't think its necessary.

0 Likes 0 ·
kevgermany avatar image kevgermany ♦♦ Osian commented ·

@rvicev

Take a look at the Orion documentation.

The Renault garage clearly does not understand how it works. It will not start charging until it detects charge voltage from the alternator at the leisure battery. You have quite a few options to control it, but depletion of the starter battery won't happen unless you force it to happen by really bad configuration. Generally it's better/easier to go direct from the starter battery to the Orion. But wherever you take the Orion input from, the wiring must be suitably sized.

The usual problem we see here is improperly set up Orions not charging the leisure battery. I've not seen one where the Orion has caused problems with the starter battery.


1 Like 1 ·
Show more comments
John Leslie avatar image
John Leslie answered ·

I believe you want the main battery fuse located before the battery isolation switch, not after; wired as close to the battery positive post as possible and in any event no more than ~180cm from the post.

You don't specify wire sizes. If you have not already anticipated this, various online calculators and phone apps will give you the correct sizing for your run lengths. For a small installation like yours, go ahead and use a 3% voltage drop input to give you a bit of margin / future proofing. The total wire cost difference won't be all that much.

1 comment
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Osian avatar image Osian commented ·

OK, an easy ammendment to make.

I haven't worked out exact placement of the battery and control panel yet. I have my own chart for wire gauge, I do tend to go the next step up anyway. The whole system should cost around £1000 and a few extra pounds here and there will be well spent

0 Likes 0 ·
jkmann avatar image
jkmann answered ·

Very easy to read your diagram. I would use a switchable breaker on the feed wire for the Orion so you have positive isolation if you are doing maintenance. Even though you feel that you have a clear understanding of when that wire will be "live," positive mechanical isolation is a good practice for all power inputs to your electrical cabinet.

The solar requires a switchable breaker (or ideally a double breaker) so you can isolate that power source. Since the solar (-) does not naturally share a ground with the van chassis, the double breaker is preferrable. However, many people do use a single breaker since the Orion does not isolate the solar (-) from the battery (-), which is also bound to the chassis.

While a battery switch is normally used as you have shown, for a smaller system like this, a switchable 100A breaker could be substituted for the switch and fuse, and save you a bit of wiring complexity.

2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Related Resources

Victron VE.Bus BMS product page

Victron 3rd party BMS compatibility page

Additional resources still need to be added for this topic