As a new owner gathering experience with the OVMS charge control, I'm assuming the daily top up algorithm is buried in the logic somewhere. Can anyone tell me if it is easily modified. I am pleased with how well it works but have to wonder if I should be concerned with the daily wear and tear on the hardware and contactor switching it imposes.
Vampire creep seems to amount to losses of 1% daily so I am curious to know if it's possible to modify the charge control to top up every other day or on a larger drop in state of charge.
The charge control you talk of is the car's, not OVMS.
In standard mode, when plugged in, the car will top itself off every day. It will also balance the battery pack (which, imho, is not a bad thing and more than offsets the negatives or excessive contactor wear and keeping battery at a higher SOC).
There is also 'storage' mode, where the car will allow the charge to drop to a relatively low SOC before charging back up. But that is more risky in the event of charger failure.
At 1% a day, in the event of a fault, you have several weeks before the car hits zero SOC. If you use a relatively low SOC limit (like with storage mode), you better keep an eye on it.
It is possible to script OVMS to (a) put the car in storage mode, (b) top-up charge when the SOC reaches a predefined limit, and (c) alert if the SOC falls below a predefined limit.
Personally, I always preferred to drive the car, and enjoy it, rather than leaving it in the garage idle for days/weeks watching the vampire drain.