Yes sounds as though he's not ready for one nap yet
HUGS - it's so hard getting them to nap at childcare, mine would only ever have 30 min naps when we had her in a nursery for a while at around one year.
A few thoughts:
- what is different about the sleeping arrangements at the childminders? Is he in a travel cot there? If so I would get him used to sleeping in a travel cot at home for naps, and hang sheets over the side both at home and at the childminders so that once he's in there it looks the same. We do this and put Katie into a travel cot at home most days for naps now, and so it doesn't bother her if we go and see friends at a weekend and she has to nap there in the travel cot.
- is it dark and quiet at the childminder? would help him sleep
- take your own sheets, sleeping bag, lovies, whatever he would have at home to try and make it as familiar as possible
- if you can get him to sleep there once or twice it will really help him associate it with sleep
HUGS
xx